Implement clipboard permissions support feature

Co-authored-by: pavelfeldman <883973+pavelfeldman@users.noreply.github.com>

examples/clipboard-permissions.md

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+# Clipboard Permissions Example
+
+This example demonstrates how to use the new `--permissions` feature to enable clipboard operations without user permission prompts.
+
+## Usage
+
+### Via Command Line Arguments
+
+```json
+{
+  "mcpServers": {
+    "playwright": {
+      "command": "npx",
+      "args": [
+        "@playwright/mcp@latest",
+        "--permissions", "clipboard-read,clipboard-write"
+      ]
+    }
+  }
+}
+```
+
+### Via Configuration File
+
+Create a config file `playwright-mcp-config.json`:
+
+```json
+{
+  "browser": {
+    "permissions": ["clipboard-read", "clipboard-write"]
+  }
+}
+```
+
+Then use it:
+
+```json
+{
+  "mcpServers": {
+    "playwright": {
+      "command": "npx", 
+      "args": [
+        "@playwright/mcp@latest",
+        "--config", "playwright-mcp-config.json"
+      ]
+    }
+  }
+}
+```
+
+### Via Environment Variable
+
+```bash
+export PLAYWRIGHT_MCP_PERMISSIONS="clipboard-read,clipboard-write"
+```
+
+## Clipboard Operations
+
+Once permissions are granted, you can use clipboard APIs via `browser_evaluate`:
+
+```javascript
+// Write to clipboard (no permission prompt)
+await browser_evaluate({ 
+  function: "() => navigator.clipboard.writeText('Copy this!')"
+})
+
+// Read from clipboard (no permission prompt)  
+await browser_evaluate({ 
+  function: "() => navigator.clipboard.readText()"
+})
+```
+
+## Supported Permissions
+
+You can grant multiple permissions as a comma-separated list:
+
+- `clipboard-read`
+- `clipboard-write` 
+- `geolocation`
+- `camera`
+- `microphone`
+- `notifications`
+- And any other [Web API permissions](https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API)
+
+Example with multiple permissions:
+
+```bash
+--permissions "clipboard-read,clipboard-write,geolocation,notifications"
+```
+
+## Notes
+
+- Permissions are applied when the browser context is created
+- The clipboard API requires secure contexts (HTTPS) in production environments
+- Some permissions may not be supported in all browsers or may require additional user activation